Mo. Rev. Stat. § 251.627
In each of the twenty-five calendar years following the adoption of a resolution adopting incremental tax financing for a regional economic development project area, unless and until incremental tax financing for such regional economic development project area is terminated by resolution of the regional economic development district board, then, in respect to every taxing district containing such regional economic development project area the county clerk or any other official required by law to ascertain the amount of the equalized assessed value of all taxable property within such regional economic development project area for the purpose of computing any debt service levies to be extended upon taxable property within such regional economic development project area shall in every year that incremental tax financing is in effect ascertain the amount of value of taxable property in such regional economic development project area by including in such amount the certified total initial equalized assessed value of all taxable real property in such regional economic development project area in lieu of the equalized assessed value of all taxable real property in such regional economic development project area. For the purpose of measuring the size of payments in lieu of taxes under the regional economic development district law, all tax levies shall then be extended to the current equalized assessed value of all property in the regional economic development project area in the same manner as the tax rate percentage is extended to all other taxable property in the taxing district.
§ 251.627, RSMo